CTRL+CLOSE Signal

The system generates a ctrl+close signal when the user closes a console. All processes attached to the console receive the signal, giving each process an opportunity to clean up before termination. When a process receives this signal, the handler function can take one of the following actions after performing any cleanup operations:

• Call ExitProcess to terminate the process.
• Return FALSE. If none of the registered handler functions returns TRUE, the default handler terminates the process.
• Return TRUE. In this case, no other handler functions are called, and a pop-up dialog box asks the user whether to terminate the process. If the user chooses not to terminate the process, the system does not close the console until the process finally terminates.